# -*- coding: utf-8 -*-

import pygame
from pygame.sprite import Sprite

class Alien(Sprite):
	"""docstring for Alien"""
	def __init__(self, ai_settings,screen):
		super(Alien, self).__init__()
		
		self.screen = screen
		self.ai_settings = ai_settings

		self.image = pygame.image.load('/Users/lvfeijun/Documents/python/alien/images/alien.bmp')
		self.rect = self.image.get_rect()

		self.rect.x = self.rect.width
		self.rect.y = self.rect.height

		self.x = float(self.rect.x)

	def blitme(self):
		self.screen.blit(self.image, self.rect)

	#更新位置
	def update(self):
		self.x += (self.ai_settings.alien_speed_factor * self.ai_settings.fleet_direction)
		self.rect.x = self.x

	#是否到最边边
	def check_edges(self):
		screeen_rect = self.screen.get_rect()
		return self.rect.right >= screeen_rect.right or self.rect.left <= 0